Apparatus for making rivets



Feh- 26 HMS. c. IR. BUCHET APPARATUS FOR MAKING RVETS Filed Sept. 20, 1944 2 Sheets-Sheet 1 IN V EN TOR.

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`APPARATUS FOR MAKING RIVETS Filed sept. `2o 1944y 2 sheets-sheet 2 C: awk-7;

1N VEN TOR.

s ATra/ver Patented Feb. 26, 1946 Conrad R. Buchet, Pasadena, Calif., -assignor of Aone-half to Milton H.L'ees, Ir.

Application September 20, 1944, ScrialNoSt :7 Claims. ',(Cl. lll-"ID This invention relates tto 1a method 'and .apparatus for forming rivets.

A `:general object of the invention is to provide a novel apparatus for forming rivets `which is particularly adapted for use in making rivets of the tubular type.

A .more specific object of 4the invention is to provide a rivet making Yapparatus including novel die members.

Another object of the invention is to provide a rivet .making apparatus wherein novel vmeans is provided for operating the .rivet forming parts.

4additional object 'of 4the inven-tion is to provide' a novel hydraulic cont-rol means vfor operating .a rivet making apparatus.

`Other objects `and the advantages :of my .invention will be .apparent from the following fdescri-ption :taken .in `connection with the accom* panying drawings. wherein:

Fig. -l is a central sectional, partially sche*- .matic, view, with parts in elevation, showing .an pparatus embodying the .features of my inven ion;

Fig. 2 is an enlarged, fragmentary, sectional view showing the die members and associated parts in the position occupied after the rivet is formed;

Fig. 3 .is a view similar to Fig. '2 showing the intermediate step in the forming of the rivet;

Fig. 4 is a view similar to Fig. Zshowing vthe final position of the die members;

Fig. 5 to Fig. 7, inclusive, are enlarged, sece tional views showing the steps in the forming or the rivet;

Fig. 8 is an enlarged, sectional View of a .modiin a rivet making apparatus which is indicated generally at I0.

'I'he usual rivet making machine heretofore employed includes means for feeding stock materiall, such as wire, to a shear, where the material is cut to the proper length. In these old machines the cut length is inserted in a die member and isthen completed and later removed.

Mechanism of this type is old :and well and forms .no part of the 'present invention. My improved method and apparatus may be used lwith these old machines. Itis .to ybe understood, however, that the :apparatus vrof this invention may be used in other machines such 'as 'a punch press or other metal working machines.

As shown, my apparatus includes a base H supporti-ng 4a track 12 which reciprocatingly supports a carriage i3. The carriage is shown as moved forwardly by a cam 14 4and 'as moved rearwardly by .a spring I5.

The carriage is provided with a bore 16. The cam lI4 engages the carriage zi3 at each side `o'f the bore It.

The bore It -has a frusto-conical forward end il.. .A die support member l5 is arranged lwithin the :bore t6 and has a tapered 'forward portion 19. )A set screw 20 serves to hold the die support member in place. The die support member has Aa cylindrical bore 2 -I in which a die 22 is mounted to reciprocate. The rear en'd of the bore 2l is closed by a plug 23 which is threaded in place. The member 23 supports a stem 24 which has a reduced Aforward plunge-r portion 25 slidably arrangedwithin a reduced portion` 26 of the plunger 2.2. A spring 2'! engages the plug 23 and also engages the die 22 vto normally urge the parts to the position shown in Fig. 1

yMounted on the base l I in alignment with the carriage I'3, `I provide a iiXed die support 3%] which has a bore 3| receiving a die support 32. The die support 32 is held in place by a set screw 33. The die support has a bore 34 which receives a die member 35. The member 35 is heldin place by a press fit within the bore 34. The die member 35 includes an end 35 which forms the under surface of the rivet head and is provided with a bore 31 in which a rivet'blank 3'8 is inserted. The rear end of the bore 31 is reduced as at 33 and receives a plunger 40 which has an enlarged operating portion 4l slidably mounted in a bore 42 in the member 35.

The portion 4I is norm-ally 'engaged b'y the upper portion ofaplunger operating member or arm a3 which is pivoted at 4d on a support 45.

The arm is engaged by a head 43 on 'a rod '41. The end o'f the rod 41, remote from the head d6, is threaded as `at 48 to receive adjusting nuts t9 which engage the rear face of the shoulder 53 on a pressure cylinder '51. The extreme end 52 of the'rod 51 engages a piston 53 which moves in the cylinder 5I.

The piston is engaged by one end of a spring 54. vThe other end of the spring 55 engages the cap member 55 threadedly engaging the end of the cylinder. The cylinder is mounted on a support 56 and is connected by a pipe 51 with a check valve 58 which communicates through a pipe 59 with a pump 60 from which a pipe 6| extends to a sump (not shown).

- The pipe 51 communicates with a chamber 62 in the cylinder and this chamber through an opening 63 communicates with the interior of the cylinder 5| so that fluid under pressure may act upon the piston 53. The chamber communicates through a pipe B with a chamber 65 in a relief valve member 56 which has a valve seat 67 engaged by a ball valve 68. A spring B9 normally urges the ball valve 68 to its seat.

A rod 'I' enters the member 66 and at its end 'H is adapted to engage the ball valve 68 to unseat the latter. The chamber |55 communi- Cates with the chamber 12 and the chamber l2 communicates through a pipe 'I3 with the sump previously mentioned.

The rod 'Iii threadedly engages an adjusting sleeve 'H and the sleeve 14 in turn threadedly engages a second rod 15. The end 16 of the rod Aengages an arm Tl on the carriage I3.

In operation it will be seen that the blank, after having been placed in the bore 3l, is in a position to be formed by the die member 2G. The cam le acting against the rearward end of the carriage 3 forces thedie member 26 into engagement with the blank 38 and the die member 35 to form the head of the rivet as indicated in Fig. 2. It will be seen that at the same time the head is being formed, the lower end of the blank is forced inwardly and extruded about the pin 40. The described operation takes place against compression of the spring 2l and without compressing the spring. As the carriage |3 continues to move forward the reciprocating die -22 is forced to recede and as it does so it compresses the' spring 21, allowing the forward plunger portion 25 of the stem 24 to protrude further beyond the portion 26 and to be forced further into the head end of the rivet until it is at a location -near the pin 422. This position is shown in Fig. 3. The pin 46 is retained in xed position during the forming operation by means of the pressure cylinder 5| and the piston 53, the latter being acted upon by fluid under pressure from the pump 60. The ball valve 68, up to this time, is closed.

At the time the plunger 25 reaches the position as shown in Fig. 3, the arm 'Vi of the carriage I3 engages the rod l5 at 16 and opens the ball valve E8, allowing Vthe oil under pressure from the pump G to by-pass the pressure cylinder 5| and to iiow, by means of thepipe S4, past the ball valve S8 and back to the sump. It will now be seen that this will allow the plunger 25 to continue to move through the rivet without the danger of damaging the plunger 40, andV to take the position as shown in Fig. 4. 'Ihe carriage I3 is next withdrawn to the right by the spring |5., This allows the plunger 25 to be withdrawn, leavingthe newly formed rivet in the die 3B.

The adjustment of the sleeve 'M on the rod 1B is such as to release the plunger 40 when the `plunger 25 is slightly spaced from the plunger ,40. This allows a web 38 to be formed in the rivet between the plungers as shown in Fig. 3. With the continued movement of the plunger 25 the web 38' is forced through and out ofthe ,rivet as shown in Fig. 4. Upon movement of the arm 43, as by the cam 19, to eject the completed rivet, the web 38' is between the plungers 4i! and 25 and iscaused to expand slightly in diameter. VThe web then drags the rivet from the die after which the web drops out of the way.

A one-way check valve 8G is arranged in the line 6d between the pressure cylinder 5| and the release valve to prevent the flow of oil back into the pressure cylinder. This valve may also act as a metering valve to control the speed at which the plunger 40 is allowed to retract.

It will be seen that by adjusting the nuts 4!) on the rod 41 the normal vposition of the plunger 49 may be altered. Also, by varying the movement of the cam I4, as by substituting another cam, any of the rivets, as shown in Figs. 5 to 7 and indicated at 38a 38h and 38e, may be formed. By the use of a die which omits the plunger 25 the rivet 33d, as shown in Fig. 8, may be formed.

Referring now primarily to Figs. 9 and 10, I show a modied form of my invention which differs only in the shape of the die faces. As shown the plunger 2E has a at face 8| and the apparatus is such that it may be used to form a'rivet 38e as shown in Fig. 10.

Fig. 1l shows a type of conventional rivet 38j which may be formed by my apparatus by fully retracting the plunger 40 and omitting the plunger 25.

Having thus described my invention and the present preferred embodiments thereof I desire to emphasize the fact that many modifications may be resorted to in a manner limited only by a just interpretation of the following claims.

Having thus described my invention, I claim:

1. In a rivet making machine, a carriage, means to mount said carriage for reciprocation, means to reciprocate said carriage, a die member slidably mounted on said carriage, said die member having a recessed end adapted to engage a blank to form a rivet head, said sliding die member having a bore therein, a plunger sldable in said bore, means to hold said plunger against axial movement in said die member, means urging said slidable die member forward, a second die member aligned with said rst die member,

said second die member having a recess adapted' to receive a rivet forming blank, said recess hav ing a reduced portion, a second plunger slidable through said reduced recess, said second slidable plunger having an operating end, a pivoted arm engaging said end, a cylinder, a piston in said cylinder, a rod engaged by said piston, adjustable means to limit the forward movement of said rod, said rod engaging said arm, means to supply fluid under pressure to said cylinder, a relief valve communicating with said cylinder, means to release said relief valve, said relief valve releasing means including an end portion adjacent said carriage, means on said carriage engaging said end portion when the carriage reaches its forward limit of movement, and means to' rock said arm to remove a formed rivet from said recess.

2'. In a rivet making machine, a carriage, means to mount said carriage for reciprocation, means to reciprocate said carriage, a die member slidably mounted on said carriage, said die member having a recessed end adapted to engage a blank to form a rivet head, said sliding die member having a bore therein, a plunger slidable in said bore, means to hold said plunger againstaxial movement in said die member, means urging said slidable die'member forward, a second die member aligned with said rst. die member, said second die member having a recess adapted to receive a rivet forming blank, said recess having a reduced portion, a second plunger slidable through said reduced recess, said second slidable plunger having an operating end, a pivoted arm engaging said end, a cylinder, a,A piston in said cylinder, a rod engaged by said piston, means to limit the forward movement of said rod, said rod engaging said arm, means to supply fluid under pressure to said cylinder, a relief valve communicating with said cylinder, means operated by said carriage to release said relief valve, and means to rock said arm to remove a formed rivet from said recess.

3. In a rivet making machine, a carriage, means to mount said carriage for reciprocation, means to reciprocate said carriage, a die support member on said carriage, a die member slidable in said support member, said die member having a recessed end adapted to engage a blank to form a rivet head, means urging said slidable die member forward in said support, a fixed die support aligned with said die support member, a second die member in said fixed die support, said second die member having a recess adapted to receive a rivet forming blank, said recess having a reduced portion, a plunger slidable through said reduced recess, said slidable plunger having an operating end, a pivoted arm engaging said end, a cylinder, a piston in said cylinder, a rod engaged by said piston, said rod engaging said arm, means to supply fluid under pressure to said cylinder, a relief valve communicating with said cylinder, means to release said relief valve, said relief valve releasing means including an end portion adjacent said carriage, means on said carriage engaging said end portion. when the carriage reaches its forward limit of movement, and means to rock said arm to remove a formed rivet from said recess.

4. In a rivet making machine, a carriage, means to mount said carriage for reciprocation, means to reciprocate said carriage, a die support member on said carriage, a die member slidable in said support member, said die member having a recessed end adapted to engage a blank to form a rivet head, said sliding die member having a bore therein, a plunger slidable in said bore, means to hold said plunger against axial movement in said die member support, means urging said slidable die member forward in said support, a fixed die support aligned with said die support member, a second die member in said fixed die support, said second die member having a recess adapted to receive a rivet forming blank, said recess having a reduced portion, a second plunger slidable through said reduced recess, said second slidable plunger having an operating end, a pivoted arm engaging said end, a cylinder, a piston in said cylinder, a rod engaged by said piston, said rod engaging said arm, means to supply fluid under pressure to said cylinder, a relief valve communicating with said cylinder, means to release said relief valve, said relief valve releasing means including an end portion adjacent said carriage, an arm on said carriage engaging said end portion when the carriage reaches its forward limit of movement, and means to rook said arm to remove a formed rivet from said recess.

5. 1n a rivet making machine, a carriage.

means to mount said carriage for reciprocation, means to reciprocate said carriage, a die member mounted on said carriage, a second die member axially aligned with said first die member, said second die member having a recess, a plunger slidable through said recess, a plunger operating member for actuating the plunger, a cylinder, a piston in said cylinder, a rod engaged by said piston and controlling movement of said plunger operating member, means to supply fluid under pressure to said cylinder, a relief valve communicating with said cylinder, and means operated by said carriage to release said relief valve.

6. In a rivet making machine, a carriage, means to mount said carriage for reciprocation, means to reciprocate said carriage, a die member slidably mounted on said carriage, said die member having an end adapted to engage a blank to form a rivet head, said sliding die member having a bore therein, a plunger slidable in said bore, means to hold said plunger against axial movement in said die member, means urging said slidable die member forward, a second die member axially aligned with said first die member, said second die member having a recess adapted to receive a rivet forming blank, a second plunger slidable through said recess, said second slidable plunger having an operating end, a plunger operating member engaging said end, a cylinder, a piston in said cylinder, a rod engaged by said piston, said rod engaging said plunger operating member, means to supply fluid under pressure to said cylinder, a relief valve communicating with said cylinder, means to release said relief valve, said relief valve releasing means including a portion adjacent said carriage, and means on said carriage engaging said end portion to shift the relief valve releasing means when the carriage reaches its forward limit of movement.

'7. In a rivet making machine, a carriage,

'means to mount said carriage for reciprocation,

means to reciprocate said carriage, a die member slidably mounted on said carriage, said die member having an end adapted to engage a blank to form a rivet head, said sliding die member having a bore therein, a plunger slidable in said bore, means to hold said plunger against axial movement in said die member, means urging said slidable die member forward, a second die member axially aligned with said first die member, said second die member having a recess adapted to receive a rivet forming blank, a second plunger slidable through said recess, said second slidable plunger having an operating end, a plunger operating member engaging said end, a cylinder, a piston in said cylinder, a rod engaged by said piston, adjustable means to limit the forward movement of said rod, said rod engaging said plunger operating member, means to supply fluid under pressure to said cylinder, a relief valve communicating with said cylinder, means to release said relief valve, said relief valve releasing `means including an end portion adjacent said carriage, means on said carriage engaging said end portion to shift the relief valve releasing means when the carriage reaches its forward limit of movement, and means to shift said plunger operating member to remove a formed rivet fromy said recess.

CONRAD R. BUCHET. 

